Cover of a motor saw



FIG. 1 is a bottom plan view of a cover of a motor saw showing our new design;

FIG. 2 is a top plan view;

FIG. 3 is a left side elevational view;

FIG. 4 is a right side elevational view; and,

FIG. 5 is a top and left-side perspective view thereof. 

The ornamental design for cover of a motor saw, as shown and described. 